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I have a dimmer (Richmond/Zano GRID500) that, when turned up to full brightness, dims the lights on and off at a rate of about 1 Hz.

Turning the brightness down just a bit makes the blinking stop.

The switch did this with 6x 50W halogen bulbs, and is continuing to do this with 6x 5W LED bulbs.

Since the blinking looks deliberate, I am wondering if the switch is trying to tell me something? I found some manufacturer's literature, but there's nothing relevant there.

Any ideas?

  • Am I to understand you changed voltages? Or are you giving us the max voltage rating of the bulbs and typo'd 12 for 120? It's common enough for 120V-friendly LEDs to work on a variety of voltages, that way the same bulb can be used anywhere from Japan to the UK... – Harper Sep 30 '18 at 0:38
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    Sorry, should have been clearer: the dimmer is, and has been, switching mains voltage (240V). The old halogen bulbs each had a 12V transformer next to them; the new LED setup is powered directly from the mains. Both configurations are pretty common here in the UK; and both exhibit the symptoms I'm describing. – NPE Sep 30 '18 at 6:22
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I managed to speak to the manufacturer, their advice was "the dimmer is faulty; have it replaced."

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